CN107370120B - Three-phase power supply protection device and electric power system - Google Patents
Three-phase power supply protection device and electric power system Download PDFInfo
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- CN107370120B CN107370120B CN201710757067.3A CN201710757067A CN107370120B CN 107370120 B CN107370120 B CN 107370120B CN 201710757067 A CN201710757067 A CN 201710757067A CN 107370120 B CN107370120 B CN 107370120B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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Abstract
The invention relates to the technical field of electric power, in particular to a three-phase power supply protection device and an electric power system. The three-phase power supply protection device is applied to a three-phase power supply connected with a three-phase load, and comprises a phase sequence detection module, a voltage detection module, a current detection module, a control module, a relay execution module and an alarm circuit. The phase sequence detection module, the voltage detection module and the current detection module are respectively connected with the three-phase power supply, so that the control module can control the relay execution module to disconnect the three-phase power supply from the three-phase load and control the alarm circuit to send out an alarm signal when one of the phase sequence state detected by the phase sequence detection module, the voltage state detected by the voltage detection module and the current state detected by the current detection module is abnormal. Through the arrangement, the states of the phase sequence, the voltage and the current of the three-phase power supply are effectively monitored, and the safety of a three-phase load connected with the three-phase power supply is effectively guaranteed.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a three-phase power supply protection device and an electric power system.
Background
With the progress of society and the continuous improvement of the living standard of people, the requirements of users on the safety and reliability of power supply are higher and higher. Especially, three-phase loads are mostly operated in an industrial control system, and for some special electromechanical equipment, such as an elevator, a central air conditioner, a traveling crane, a liquid cooling unit, a three-phase motor and the like, when a three-phase power supply fails, the equipment is easily damaged and even accidents occur. Therefore, effectively monitoring the three-phase power supply to ensure the safety of the three-phase load is an urgent technical problem to be solved.
Disclosure of Invention
The present invention provides a three-phase power protection device and an electric power system, wherein the three-phase power protection device is applied to a three-phase power supply connected with a three-phase load. Through setting up phase sequence detection module, voltage detection module, current detection module, control module, relay execution module and warning circuit to effectively monitor phase sequence, voltage and the electric current of three-phase power, and then effectively ensure the safety of the three-phase load of being connected with three-phase power.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
the utility model provides a three-phase power protection device, is applied to the three-phase power who is connected with three-phase load, three-phase power protection device includes: phase sequence detection module, voltage detection module, current detection module, control module, relay execution module and warning circuit, phase sequence detection module's input be a plurality of and respectively with each of three phase current is connected, the output with control module connects, voltage detection module's input with three phase current is connected, the output with control module connects, current detection module's input with three phase current is connected, the output with control module connects, relay execution module's control end with control module connects, the input with three phase current is connected, the output with the three phase current is connected, the three phase load is connected, warning circuit with control module connects.
The phase sequence detection module detects the phase sequence of the three-phase power supply, obtains a phase sequence signal and sends the phase sequence signal to the control module, the voltage detection module detects the voltage value of the three-phase power supply and sends the voltage value to the control module, and the current detection module detects the current value of the three-phase power supply and sends the current value to the control module.
The control module is stored with a preset phase sequence state corresponding relation, a preset current value range and a preset voltage value range, the control module obtains the phase sequence state of the three-phase power supply according to the phase sequence signal and the preset phase sequence corresponding relation, obtains the voltage state of the three-phase power supply according to the voltage value and the preset voltage value range of the three-phase power supply, obtains the current state of the three-phase power supply according to the current value and the preset current value range of the three-phase power supply, and controls the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load and control the alarm circuit to send an alarm signal when one of the phase sequence state, the voltage state and the current state is abnormal.
In a preferred embodiment of the present invention, in the three-phase power protection apparatus, four signal input ends of the phase sequence detection module are respectively connected to the first phase, the second phase, the third phase and the neutral line N of the three-phase power supply, four signal output ends of the phase sequence detection module are respectively connected to the control module, the phase sequence detection module detects that a phase sequence signal obtained by the three-phase power supply is a sampling signal, the control module receives the sampling signal, determines whether the phase sequence of the three-phase power supply is abnormal according to a corresponding relationship between the sampling signal and a preset phase sequence, and obtains a corresponding abnormal phase sequence state when the phase sequence is abnormal, controls the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load, and controls the alarm circuit to send an alarm signal.
In a preferred embodiment of the present invention, in the three-phase power protection apparatus, a plurality of input ports of the voltage detection module are provided, and the first phase, the second phase, the third phase and the neutral line N of the three-phase power are respectively and correspondingly connected to one input port of the voltage detection module, so that the voltage detection module detects voltages of the first phase, the second phase and the third phase to obtain a voltage signal of the first phase, a voltage signal of the second phase and a voltage signal of the third phase, and sends the voltage signals to the control module.
The control module judges whether the voltage state of the three-phase power supply is abnormal according to the voltage signal of the first phase, the voltage signal of the second phase, the voltage signal of the third phase and a preset voltage value range, obtains a corresponding abnormal voltage state when the voltage state is abnormal, controls the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load, and controls the alarm circuit to send an alarm signal.
In a preferred embodiment of the present invention, in the three-phase power protection apparatus, a plurality of input ports of the current detection module are provided, and the first phase, the second phase and the third phase of the three-phase power are respectively and correspondingly connected to an input port of one current detection module, so that the current detection module detects currents of the first phase, the second phase and the third phase to obtain a current signal of the first phase, a current signal of the second phase and a current signal of the third phase, and sends the current signals to the control module.
The control module judges whether the current state of the three-phase power supply is abnormal according to the current signal of the first phase, the current signal of the second phase, the current signal of the third phase and a preset current value range, obtains a corresponding abnormal current state when the current state is abnormal, controls the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load, and controls the alarm circuit to send an alarm signal. In a preferred embodiment of the present invention, in the three-phase power protection apparatus, a plurality of input terminals of the relay execution module are provided, and the first phase, the second phase, the third phase and the neutral line N of the three-phase power are respectively connected to one input terminal of the relay execution module.
In a preferred embodiment of the present invention, in the three-phase power protection device, the three-phase power protection device further includes a display module, and the display module is connected to the control module to receive and display the phase sequence state, the voltage state, and the current state of the three-phase power transmitted by the control module.
In a preferred embodiment of the present invention, in the three-phase power protection device, the three-phase power protection device further includes a working indication circuit, the indication circuit includes a plurality of indication lamps, each of the indication lamps is respectively connected to the control module, and the phase sequence detection module, the voltage detection module, and the current detection module respectively correspond to at least one indication lamp.
In a preferred embodiment of the present invention, in the three-phase power protection device, the voltage detection module is an over-under voltage detection module, the current detection module is an over-under current detection module, and the control module employs a single chip microcomputer of an industrial chip PIC.
In a preferred embodiment of the present invention, in the three-phase power protection device, the three-phase power protection device further includes an electrical leakage protection device, and the electrical leakage protection device is electrically connected to the control module.
The invention also provides an electric power system which comprises a three-phase power supply and the three-phase power supply protection device, wherein the three-phase power supply protection device is electrically connected with the three-phase power supply.
The invention provides a three-phase power supply protection device and an electric power system, wherein the three-phase power supply protection device is provided with a phase sequence detection module, a voltage detection module, a current detection module, a control module, a relay execution module and an alarm circuit, so that when one of the phase sequence state obtained by the control module according to the phase sequence detected by the phase sequence detection module, the voltage state obtained according to the voltage detected by the voltage detection module and the current state obtained according to the current detected by the current detection module is abnormal, the relay execution module is controlled to disconnect the three-phase power supply and the three-phase load and control an alarm circuit to send out an alarm signal, the states of the phase sequence, the voltage and the current of the three-phase power supply are effectively monitored through the arrangement, and the safety of a three-phase load connected with the three-phase power supply is effectively guaranteed.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention, and for those skilled in the art, other related drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a three-phase power protection apparatus according to an embodiment of the present invention.
Fig. 2 is an application block diagram of a three-phase power protection device according to an embodiment of the present invention.
Fig. 3 is a pin diagram of a phase sequence detection module according to an embodiment of the present invention.
Fig. 4 is a pin diagram of a control module according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an alarm circuit according to an embodiment of the present invention.
Fig. 6 is another structural block diagram of a three-phase power protection device according to an embodiment of the present invention.
Fig. 7 is a block diagram of a power system according to an embodiment of the present invention.
Icon: 10-a power system; 20-three phase load; 100-three-phase power protection device; 110-phase sequence detection module; 120-a voltage detection module; 130-a current detection module; 140-a control module; 150-relay execution module; 160-alarm circuit; 170-a display module; 180-a working indication circuit; 190-local power supply; 210-a push button switch; 300-three phase power supply.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and fig. 2, the present invention provides a three-phase power protection apparatus 100, which is applied to a three-phase power source 300 connected with a three-phase load 20, wherein the three-phase power protection apparatus 100 is connected to the three-phase power source 300 to effectively monitor and protect the three-phase power source 300.
The three-phase power protection apparatus 100 includes: phase sequence detection module 110, voltage detection module 120, current detection module 130, control module 140, relay execution module 150 and warning circuit 160, phase sequence detection module 110's input be a plurality of and respectively with each of three phase current source 300 is connected, the output with control module 140 connects, voltage detection module 120's input with three phase current source 300 is connected, the output with control module 140 connects, current detection module 130's input with three phase current source 300 is connected, the output with control module 140's input port is connected, relay execution module 150's control end with control module 140 connects, the input with three phase current source 300 is connected, the output with three phase load 20 connects, warning circuit 160 with control module 140 connects.
The phase sequence detection module 110 detects a phase sequence of the three-phase power supply 300 and transmits the phase sequence to the control module 140, the voltage detection module 120 detects a voltage value of the three-phase power supply 300 and transmits the voltage value to the control module 140, and the current detection module 130 detects a current value of the three-phase power supply 300 and transmits the current value to the control module 140.
The control module 140 stores a preset phase sequence state corresponding relationship, a preset current value range and a preset voltage value range, the control module 140 obtains the phase sequence state of the three-phase power supply 300 according to the phase sequence and the preset phase sequence corresponding relationship of the three-phase power supply 300, obtains the voltage state of the three-phase power supply 300 according to the voltage value and the preset voltage value range of the three-phase power supply 300, and obtains the current state of the three-phase power supply 300 according to the current value and the preset current value range of the three-phase power supply 300, and when one of the phase sequence state, the voltage state and the current state is abnormal, the relay execution module 150 is controlled to disconnect the connection between the three-phase power supply 300 and the three-phase load 20 and control the alarm circuit 160 to send an alarm signal.
Through the above arrangement, the situation that the phase sequence is abnormal, the voltage is abnormal and/or the current is abnormal when the three-phase power supply 300 supplies power to the three-phase load 20 is effectively avoided, and further the situation that the three-phase power supply 300 or the three-phase load 20 is in failure or even an accident is caused when the abnormality occurs is effectively avoided.
Referring to fig. 3, in the present embodiment, a plurality of signal input terminals of the phase sequence detecting module 110 are respectively connected to the first phase, the second phase, the third phase and the neutral line N of the three-phase power supply 300. The phase sequence detection module 110 has four signal output ends respectively connected to the control module 140, the phase sequence detection module 110 detects that a phase sequence signal obtained by the phase sequence of the three-phase power supply 300 is a sampling signal, the control module 140 determines whether the phase sequence of the three-phase power supply 300 is abnormal according to the sampling signal and a preset phase sequence corresponding relationship, and obtains a corresponding abnormal phase sequence state when the phase sequence is abnormal, controls the relay execution module 150 to disconnect the three-phase power supply 300 from the three-phase load 20, and controls the alarm circuit 160 to send an alarm signal.
Specifically, the output end of the phase sequence detection module 110 has four signal lines, and the corresponding output sampling signals are the first signal, the second signal, the third signal and the fourth signal, respectively. In this embodiment, the first signal, the second signal, the third signal and the fourth signal are all normal when they are high level signals, and are abnormal when there is at least one low level signal. And when the phase sequence is abnormal, whether the phase sequence is in a reverse order or a phase loss is obtained according to a preset phase sequence corresponding relation, and when the phase loss occurs, a specific lost phase is obtained.
For example, the preset phase sequence correspondence may be: a normal state when the first signal, the second signal, the third signal, and the fourth signal are at a high level; when the first signal, the second signal and the fourth signal are all high level and the third signal is low level, the sequence is reverse; the first phase is absent when the first signal and the fourth signal are at high level and the second signal and the third signal are at low level; the second phase is absent when the second signal and the third signal are at a high level and the first signal and the fourth signal are at a low level; the third phase is absent when the first signal, the second signal and the third signal are at a high level and the fourth signal is at a low level; the first phase and the second phase are absent when the first signal, the second signal or the third signal is at a low level and the fourth signal is at a high level; the first phase and the third phase are absent when the first signal is at a high level and the second signal, the third signal and the fourth signal are at a low level; when the first signal, the third signal and the fourth signal are all low level and the second phase sequence is high level signal, the second phase and the third phase are absent; when the first signal, the second signal, the third signal and the fourth signal are all low level, the first phase, the second phase and the third phase are absent.
Through the above setting, the accuracy of phase sequence detection is effectively ensured, so that when the phase sequence of the three-phase power supply 300 is abnormal, the specific missing phase of the three-phase power supply 300 can be obtained according to the preset phase sequence corresponding relation, so that a worker can overhaul the three-phase power supply 300 according to the specific missing phase, the overhaul efficiency of the worker is greatly improved, and the operation and maintenance cost is effectively reduced.
Optionally, in this embodiment, the number of the input ports of the voltage detection module 120 is multiple, and the first phase, the second phase, the third phase and the neutral line N of the three-phase power supply 300 are respectively and correspondingly connected to one input port of the voltage detection module 120, so that the voltage detection module 120 detects voltages of the first phase, the second phase and the third phase to obtain a voltage signal of the first phase, a voltage signal of the second phase and a voltage signal of the third phase correspondingly and sends the voltage signals to the control module 140. The control module 140 determines whether the voltage state of the three-phase power supply 300 is abnormal according to the voltage signal of the first phase, the voltage signal of the second phase, the voltage signal of the third phase, and a preset voltage value range, and obtains a corresponding abnormal voltage state when the voltage state is abnormal, controls the relay execution module 150 to disconnect the connection between the three-phase power supply 300 and the three-phase load 20, and controls the alarm circuit 160 to send an alarm signal.
Optionally, in this embodiment, the voltage detection module 120 is an over-under voltage detection module. Specifically, the voltage signal of the first phase, the voltage signal of the second phase, and the voltage signal of the third phase are detected voltage values corresponding to the respective phases, and when the voltage values of the respective voltage signals are within the preset voltage value range, the voltages of the respective phases of the three-phase power supply 300 are normal; when at least one voltage signal exists in the voltage signals of the first phase, the second phase or the third phase and is located outside the preset voltage value range, the voltage of the phase corresponding to the at least one voltage signal is abnormal, and overvoltage is generated when the voltage of the at least one voltage signal exceeds the maximum value of the preset voltage value range, and undervoltage is generated when the voltage of the at least one voltage signal is lower than the minimum value of the preset voltage value range. The accuracy of the voltage detection result is effectively guaranteed through the arrangement.
Optionally, the number of the input ports of the current detecting module 130 is multiple, the first phase, the second phase and the third phase of the three-phase power supply 300 are respectively and correspondingly connected to the input port of one current detecting module 130, so that the current detecting module 130 detects the currents of the first phase, the second phase and the third phase to obtain a current signal of the first phase, a current signal of the second phase and a current signal of the third phase corresponding to each other and sends them to the control module 140, the control module 140 determines whether the current state of the three-phase power supply 300 is abnormal according to the current signal of the first phase, the current signal of the second phase, the current signal of the third phase and a preset current value range, and obtains a corresponding abnormal current state when abnormal, controls the relay execution module 150 to disconnect the three-phase power supply 300 from the three-phase load 20, and controls the alarm circuit 160 to send an alarm signal.
Optionally, in this embodiment, the current detection module 130 is an under current detection module. Specifically, the current signal of the first phase, the current signal of the second phase, and the current signal of the third phase are detected current values corresponding to each other, and when the current value of each current signal is within the preset current value range, the current of each phase of the three-phase power supply 300 is normal; when at least one current signal exists in the current signals of the first phase, the second phase or the third phase and is positioned outside the preset current value range, the current of the corresponding phase of the at least one current signal is abnormal, and the current of the at least one current signal is over-current when exceeding the maximum value of the preset current value range and is under-current when being lower than the minimum value of the preset current value range. The accuracy of the current detection result is effectively guaranteed through the arrangement.
Optionally, when one of the phase sequence state, the voltage state, and the current state is abnormal, the relay execution module 150 is controlled to disconnect the three-phase power supply 300 from the three-phase load 20 and control the alarm circuit 160 to send an alarm signal, and the control module 140 is further configured to adjust the phase sequence, the voltage, and/or the current of the three-phase power supply 300 according to the abnormal state in the phase sequence state, the voltage state, and the current state, so that the phase sequence, the voltage, and the current of the three-phase power supply 300 are all restored to a normal state, and control the relay execution module 150 to connect the three-phase power supply 300 with the three-phase load 20, so that the three-phase power supply 300 supplies power to the three-phase load 20 again.
Optionally, the number of the input terminals of the relay execution module 150 is multiple, and the first phase, the second phase, the third phase and the neutral line N of the three-phase power supply 300 are respectively and correspondingly connected to one input terminal of the relay execution module 150. When the phase sequence detection module 110, the voltage detection module 120 and/or the current detection module 130 detect that the first phase, the second phase and/or the third phase are/is abnormal, the relay execution module 150 controls the first phase, the second phase and the third phase to be disconnected from the three-phase load 20, respectively, so as to effectively ensure the safety of the three-phase power supply 300.
Referring to fig. 4, in the present embodiment, the control module 140 is an integrated circuit chip having signal processing capability. May be a general purpose Processor including a Central Processing Unit (CPU), a Network Processor (NP), and the like. But may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The general purpose processor may be a microprocessor, any conventional processor, etc. In this embodiment, the control module 140 is a single chip. Specifically, the control module 140 is a single chip microcomputer using an industrial chip PIC.
The alarm circuit 160 may include, but is not limited to, one or more of an audible alarm circuit, an optical alarm circuit, an audible and visual alarm circuit, or a short message alarm circuit, as long as an alarm can be implemented to effectively prompt the staff. Referring to fig. 5, in the present embodiment, the alarm circuit 160 is an audible and visual alarm circuit.
Optionally, the number of the alarm circuits 160 is multiple, and the phase sequence detection module 110, the voltage detection module 120, and the current detection module 130 correspond to one alarm circuit 160, respectively, so that when the detected result of the phase sequence detection module 110, the voltage detection module 120, or the current detection module 130 is in an abnormal state, the control module 140 controls the corresponding alarm circuit 160 to send out an alarm signal.
To avoid the alarm circuit 160 from affecting the personnel during their maintenance. The alarm circuit 160 may alarm and stop the alarm automatically after a preset time period under the control of the control module 140, or the alarm signal may be manually cut off by the user. Referring to fig. 6, in this embodiment, optionally, the three-phase power protection apparatus 100 further includes a button switch 210, and the button switch 210 is connected to the control module 140. The operator manually removes the alarm signal from the alarm circuit 160 by pressing the push button switch 210.
In this embodiment, the three-phase power protection apparatus 100 further includes a local power supply 190, and the local power supply 190 is respectively connected to the phase sequence detection module 110, the voltage detection module 120, the current detection module 130, and the control module 140. So that the local power supply 190 supplies power to the phase sequence detection module 110, the voltage detection module 120, the current detection module 130 and the control module 140, respectively.
Optionally, in this embodiment, the three-phase power protection apparatus 100 further includes a display module 170, and the display module 170 is connected to the control module 140 to receive and display the phase sequence state, the voltage state, and the current state of the three-phase power 300 sent by the control module 140. So that the worker can visually know whether the three-phase power supply 300 is abnormal or not and display the specific condition of the abnormality when the abnormality occurs.
In order to further play a good role in prompting the staff. Optionally, in this embodiment, the three-phase power protection device 100 further includes a work indication circuit 180, where the indication circuit includes a plurality of indication lamps, each of the indication lamps is connected to the control module 140, and the phase sequence detection module 110, the voltage detection module 120, and the current detection module 130 correspond to at least one indication lamp respectively. The control module 140 controls the indicator lamps to be turned on when the detection results of the phase sequence detection module 110, the voltage detection module 120, and the current detection module 130 are normal, and controls the indicator lamp corresponding to at least one of the phase sequence detection module 110, the voltage detection module 120, or the current detection module 130 to be turned off when the detection result of the at least one of the phase sequence detection module 110, the voltage detection module 120, or the current detection module 130 is abnormal.
Optionally, the phase sequence detection module 110 corresponds to a plurality of indicator lights, each indicator light corresponds to an abnormal state detected by the phase sequence detection module 110, and the control module 140 controls the corresponding indicator light to be turned off according to the abnormal state detected by the phase sequence detection module 110. The voltage detection module 120 corresponds to a plurality of indicator lights, each indicator light corresponds to an abnormal state detected by the voltage detection module 120, and the control module 140 controls the corresponding indicator light to be turned off according to the abnormal state detected by the voltage detection module 120. The current detection module 130 corresponds to a plurality of indicator lights, each indicator light corresponds to an abnormal state detected by the current detection module 130, and the control module 140 controls the corresponding indicator light to be turned off according to the abnormal state detected by the current detection module 130.
In order to avoid the situation of electric leakage occurring when the three-phase power supply 300 supplies power to the three-phase load 20, optionally, in this embodiment, the three-phase power supply protection device 100 further includes an electric leakage protection device, and the electric leakage protection device is electrically connected to the control module 140.
Referring to fig. 7, on the basis of the above description, the present invention further provides an electric power system 10, where the electric power system 10 includes a three-phase power source 300 and the three-phase power source protection device 100, and the three-phase power source protection device 100 is electrically connected to the three-phase power source 300.
Since the power system 10 includes the three-phase power protection apparatus 100, the power system 10 has corresponding features of the three-phase power protection apparatus 100, and details thereof are not repeated here.
In summary, in the three-phase power protection apparatus 100 and the power system 10 provided by the present invention, the three-phase power protection apparatus 100 is provided with the phase sequence detection module 110, the voltage detection module 120, the current detection module 130, the control module 140, the relay execution module 150, and the alarm circuit 160, so that when one of the phase sequence state obtained by the control module 140 according to the phase sequence detected by the phase sequence detection module 110, the voltage state obtained by the voltage detection module 120 detecting the voltage, and the current state obtained by the current detection module 130 detecting the current is abnormal, the relay execution module 150 is controlled to disconnect the connection between the three-phase power 300 and the three-phase load 20 and the alarm circuit 160 is controlled to send an alarm signal, so as to monitor the phase sequence, the voltage, and the current of the three-phase power 300, and further effectively ensure the safety of the three-phase load 20 connected to the three-phase power 300, and effectively prompt the operator when the phase sequence, voltage or current of the three-phase power supply 300 is abnormal. The display module 170 and the work instruction circuit 180 are arranged to prompt the staff to perform further processing.
It is to be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A three-phase power supply protection device is applied to a three-phase power supply connected with a three-phase load, and is characterized by comprising: the phase sequence monitoring system comprises a phase sequence detection module, a voltage detection module, a current detection module, a control module, a relay execution module and an alarm circuit, wherein the phase sequence detection module comprises a plurality of input ends which are respectively connected with each three-phase power supply, the output ends of the phase sequence detection module are connected with the control module, the input end of the voltage detection module is connected with the three-phase power supply, the output end of the voltage detection module is connected with the control module, the input end of the current detection module is connected with the three-phase power supply, the output end of the current detection module is connected with the control module, the control end of the relay execution module is connected with the control module, the input end of the relay execution module is connected with the three-phase power supply, the;
the phase sequence detection module detects the phase sequence of the three-phase power supply to obtain a phase sequence signal and sends the phase sequence signal to the control module, the voltage detection module detects the voltage value of the three-phase power supply and sends the voltage value to the control module, and the current detection module detects the current value of the three-phase power supply and sends the current value to the control module;
the control module is stored with a preset phase sequence state corresponding relation, a preset current value range and a preset voltage value range, the control module obtains the phase sequence state of the three-phase power supply according to the phase sequence signal and the preset phase sequence corresponding relation, obtains the voltage state of the three-phase power supply according to the voltage value and the preset voltage value range of the three-phase power supply, obtains the current state of the three-phase power supply according to the current value and the preset current value range of the three-phase power supply, and controls the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load and controls the alarm circuit to send an alarm signal when one of the phase sequence state, the voltage state and the current state is abnormal;
the phase sequence detection module comprises a phase sequence detection module, a phase sequence detection module and a phase sequence detection module, wherein the phase sequence detection module comprises four signal lines at the output end, correspondingly output sampling signals are a first signal, a second signal, a third signal and a fourth signal respectively, the first signal, the second signal, the third signal and the fourth signal are normal when all the signals are high-level signals, the signals are abnormal when at least one low-level signal exists, whether the phase sequence is in a reverse sequence or a phase loss is obtained according to a preset phase sequence corresponding relation when the signals are abnormal, and a specific lost phase is obtained when the phase loss exists;
the preset phase sequence corresponding relation is as follows: a normal state when the first signal, the second signal, the third signal, and the fourth signal are at a high level; when the first signal, the second signal and the fourth signal are all high level and the third signal is low level, the sequence is reverse; the first phase is absent when the first signal and the fourth signal are at high level and the second signal and the third signal are at low level; the second phase is absent when the second signal and the third signal are at a high level and the first signal and the fourth signal are at a low level; the third phase is absent when the first signal, the second signal and the third signal are at a high level and the fourth signal is at a low level; the first phase and the second phase are absent when the first signal, the second signal or the third signal is at a low level and the fourth signal is at a high level; the first phase and the third phase are absent when the first signal is at a high level and the second signal, the third signal and the fourth signal are at a low level; when the first signal, the third signal and the fourth signal are all low level and the second phase sequence is high level signal, the second phase and the third phase are absent; when the first signal, the second signal, the third signal and the fourth signal are all low level, the first phase, the second phase and the third phase are absent.
2. The three-phase power protection device according to claim 1, wherein the number of the input ports of the voltage detection module is plural, and the first phase, the second phase, the third phase and the neutral line N of the three-phase power are respectively and correspondingly connected to one input port of the voltage detection module, so that the voltage detection module detects the voltages of the first phase, the second phase and the third phase to obtain a voltage signal of the first phase, a voltage signal of the second phase and a voltage signal of the third phase, and sends the voltage signals to the control module;
the control module judges whether the voltage state of the three-phase power supply is abnormal according to the voltage signal of the first phase, the voltage signal of the second phase, the voltage signal of the third phase and a preset voltage value range, obtains a corresponding abnormal voltage state when the voltage state is abnormal, controls the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load, and controls the alarm circuit to send an alarm signal.
3. The three-phase power supply protection device according to claim 1, wherein the number of the input ports of the current detection module is plural, and the first phase, the second phase and the third phase of the three-phase power supply are respectively and correspondingly connected to the input port of one current detection module, so that the current detection module detects the currents of the first phase, the second phase and the third phase to obtain a current signal of the first phase, a current signal of the second phase and a current signal of the third phase correspondingly and sends the current signals to the control module;
the control module judges whether the current state of the three-phase power supply is abnormal according to the current signal of the first phase, the current signal of the second phase, the current signal of the third phase and a preset current value range, obtains a corresponding abnormal current state when the current state is abnormal, controls the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load, and controls the alarm circuit to send an alarm signal.
4. The three-phase power protection device of claim 1, wherein the relay actuating module has a plurality of input terminals, and the first phase, the second phase, the third phase and the neutral line N of the three-phase power are respectively connected to one input terminal of the relay actuating module.
5. The apparatus according to claim 1, further comprising a display module connected to the control module for receiving and displaying the phase sequence status, the voltage status and the current status of the three-phase power transmitted by the control module.
6. The apparatus according to claim 1, further comprising an operation indication circuit, wherein the operation indication circuit comprises a plurality of indication lamps, each indication lamp is connected to the control module, and the phase sequence detection module, the voltage detection module and the current detection module correspond to at least one indication lamp respectively.
7. The three-phase power protection device of claim 1, wherein the voltage detection module is an over-under voltage detection module, the current detection module is an over-under current detection module, and the control module is a single chip microcomputer of an industrial chip PIC.
8. The three-phase power protection device of claim 1, further comprising an electrical leakage protection device electrically connected to the control module.
9. An electrical power system comprising a three-phase power source and a three-phase power protection device of any one of claims 1 to 8 electrically connected to the three-phase power source.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2588634Y (en) * | 2002-11-20 | 2003-11-26 | 沙万乾 | Intelligent electricity distribution cabinet |
| CN201315473Y (en) * | 2008-12-09 | 2009-09-23 | 李俊苇 | Asynchronous motor protector |
| CN105610128A (en) * | 2014-11-25 | 2016-05-25 | 西安银河网电智能电气有限公司 | Intelligent motor control protector |
-
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2588634Y (en) * | 2002-11-20 | 2003-11-26 | 沙万乾 | Intelligent electricity distribution cabinet |
| CN201315473Y (en) * | 2008-12-09 | 2009-09-23 | 李俊苇 | Asynchronous motor protector |
| CN105610128A (en) * | 2014-11-25 | 2016-05-25 | 西安银河网电智能电气有限公司 | Intelligent motor control protector |
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